docs: def import_subview(self, idx, subview):
          """
          Add the given subview to the corpus.
  
          Args:
              idx (str): An idx that is unique in the corpus for identifying the subview.
                         If already a subview exists with the given id it will be overridden.
              subview (Subview): The subview to add.
          """
  
          subview.corpus = self
          self._subviews[idx] = subview